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3 years ago

Gems are _____. rare, common, not true minerals, not valuable

Chemistry

2 answers:

ehidna [41]3 years ago

7 0

The correct answer is Gems are rare

bogdanovich [222]3 years ago

3 0

Gems are rare.

They are NOT common.
They are TRUE minerals.
They ARE valuable

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Which measurement is a vector?

Andreas93 [3]

To measure a vector is to characterize both its direction (in one form or another) and a value (usually, a number). For example, velocity of a car moving on the road is a vector and, to measure it, we have to specify its direction (e.g. North or at angle 20 degrees from the North) and value (e.g. 40 m/sec).

4 0

2 years ago

the value of kc for the following reaction is 0.630 at 409 K N2O4(g) --> 2NO2(g) if a reaction vessel at that temperature int

stealth61 [152]

Answer: The concentration of nitrogen dioxide at equilibrium is 0.063 M

Explanation:

We are given:

Initial concentration of nitrogen dioxide = 0.0250 M

Initial concentration of dinitrogen tetraoxide = 0.0250 M

For the given chemical equation:

$N_2O_4(g)\rightleftharpoons 2NO_2(g)$

Initial: 0.025 0.025

At eqllm: 0.025-x 0.025+2x

The expression of $K_c$ for above equation follows:

$K_c=\frac{[NO_2]^2}{[N_2O_4]}$

We are given:

$K_c=0.630$

Putting values in above expression, we get:

$0.630=\frac{(0.025+2x)^2}{(0.025-x)}\\\\x=-0.2013,0.019$

Neglecting the negative value of 'x', because concentration cannot be negative

So, equilibrium concentration of nitrogen dioxide = (0.025 + 2x) = [0.025 + 2(0.019)] = 0.063 M

Hence, the concentration of nitrogen dioxide at equilibrium is 0.063 M

6 0

3 years ago

A substance which contains various elements or compounds without bonding or in fixed proportions is a(n) _____.

julia-pushkina [17]

The correct answer that would best complete the given statement above would be the word MIXTURE. A substance which contains various elements or compounds without bonding or in fixed proportions is a mixture. When a chemical union occurs, this is when a compound is being formed. Hope this answer helps.

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3 years ago

One loss mechanism for ozone in the atmosphere is the reaction with the ho2 radical what is the rate law expression

Elis [28]

It turns unto h2o and then back into water

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3 years ago

Write the combustion product of butane in excess oxygen.

Leto [7]

Answer:

The name of the products are CO2 = carbon dioxide and H2O = water. The type of reaction is a combustion reaction.

Explanation: